Star streams that are seen around the Milky Way Galaxy are probably the result of:
A) stars ejected from the Galaxy by gravitational encounters with the central black hole.
B) tidal interactions with satellite galaxies.
C) a collision with a large galaxy in the distant past.
D) stars being pulled from the Andromeda Galaxy.
E) spiral density waves.
Question 2
If a white dwarf gains sufficient mass, it can become a:
A) brown dwarf.
B) type II supernova.
C) type I supernova.
D) planetary nebula.
E) black dwarf.
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Artist's conception of the birth of a star within a dense molecular cloud.
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